Drive unit and manufacturing method thereof

• US 7,973,502 B2
• Filed: 12/30/2008
• Issued: 07/05/2011
• Est. Priority Date: 03/21/2008
• Status: Expired due to Fees

• Current Assignee: Aisin AW Company Limited (Aisin Corp.)
• Original Assignee: Aisin AW Company Limited (Aisin Corp.)
• Inventors: Nakagawa, Yoshinari, Koshida, Takafumi, Atarashi, Tomoo
• Primary Examiner(s): Leykin; Rita
• Application Number:
  US12/318,498
• Publication Number:
  US 20090237018A1
• Time in Patent Office: 917 Days
• Field of Search: 318/400.16, 318/400.39, 318/400.38, 318/830, 318/491, 318/831, 318/538, 318606-608, 318/459, 318/464, 318/465, 319/68.B, 319/191, 360/73.03
• US Class Current: 318/400.16
• CPC Class Codes: G01B 7/30 for measuring angles or tapers; for testing the alignment of axes
• CPC Class Codes: H02K 15/00 Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
• CPC Class Codes: H02K 29/12 using detecting coils using the machine windings as detecting coil
• CPC Class Codes: H02P 6/16 Circuit arrangements for detecting position
• CPC Class Codes: H02P 6/182 using back-emf in windings
• CPC Class Codes: Y10T 29/49009 Dynamoelectric machine

Abstract

A drive unit includes a rotating electrical machine; a rotation sensor that detects a rotational position of a rotor of the rotating electrical machine, and a storage medium. In an inspecting step of measuring a counter electromotive force by mechanically driving the rotating electrical machine after the rotating electrical machine and the rotation sensor are assembled together, positional error information of the rotation sensor obtained based on information of the counter electromotive force and output information from the rotation sensor is stored in the storage medium. The storage medium is integrally provided to the drive unit in such a state that the storage medium is readable upon assembling a control device that controls the rotating electrical machine.

Claims

1. A drive unit, comprising:

a rotating electrical machine;

a rotation sensor that detects a rotational position of a rotor of the rotating electrical machine, and

a storage medium, wherein;

in an inspecting step of measuring a counter electromotive force by mechanically driving the rotating electrical machine after the rotating electrical machine and the rotation sensor are assembled together, positional error information of the rotation sensor obtained based on information of the counter electromotive force and output information from the rotation sensor is stored in the storage medium, and

the storage medium is integrally provided to the drive unit in such a state that the storage medium is readable upon assembling a control device that controls the rotating electrical machine.

2. The drive unit according to claim 1, wherein in the inspecting step, characteristic information of the rotating electrical machine is further obtained based on the information of the counter electromotive force obtained by mechanically driving the rotating electrical machine, and the characteristic information is further stored in the storage medium.

3. The drive unit according to claim 1, wherein the storage medium is a medium capable of optically reading stored information and is attached to a surface of a case accommodating the rotating electrical machine and the rotation sensor.

4. The drive unit according to claim 1, wherein the storage medium is an electromagnetic storage medium that is provided so as to be readable from outside a case accommodating the rotating electrical machine and the rotation sensor or readable from the control device integrally provided in the case.

5. The drive unit according to claim 1, wherein management information including an identification code of the rotating electrical machine is further stored in the storage medium.

6. The drive unit according to claim 1, wherein the positional error information of the rotation sensor is information of a zero-point error between a voltage waveform as the information of the counter electromotive force and a pulse signal as the output information from the rotation sensor.

7. The drive unit according to claim 2, wherein the inspecting step includes a step of measuring an effective value of a voltage waveform as the information of the counter electromotive force, and the characteristic information of the rotating electrical machine includes information of the effective value of the voltage waveform.

8. The drive unit according to claim 2, wherein the storage medium is a medium capable of optically reading stored information and is attached to a surface of a case accommodating the rotating electrical machine and the rotation sensor.

9. The drive unit according to claim 2, wherein the storage medium is an electromagnetic storage medium that is provided so as to be readable from outside a case accommodating the rotating electrical machine and the rotation sensor or readable from the control device integrally provided in the case.

10. The drive unit according to claim 2, wherein management information including an identification code of the rotating electrical machine is further stored in the storage medium.

11. The drive unit according to claim 2, wherein the positional error information of the rotation sensor is information of a zero-point error between a voltage waveform as the information of the counter electromotive force and a pulse signal as the output information from the rotation sensor.

12. The drive unit according to claim 3, wherein management information including an identification code of the rotating electrical machine is further stored in the storage medium.

13. The drive unit according to claim 3, wherein the positional error information of the rotation sensor is information of a zero-point error between a voltage waveform as the information of the counter electromotive force and a pulse signal as the output information from the rotation sensor.

14. The drive unit according to claim 4, wherein management information including an identification code of the rotating electrical machine is further stored in the storage medium.

15. The drive unit according to claim 4, wherein the positional error information of the rotation sensor is information of a zero-point error between a voltage waveform as the information of the counter electromotive force and a pulse signal as the output information from the rotation sensor.

16. The drive unit according to claim 5, wherein the positional error information of the rotation sensor is information of a zero-point error between a voltage waveform as the information of the counter electromotive force and a pulse signal as the output information from the rotation sensor.

17. The drive unit according to claim 8, wherein management information including an identification code of the rotating electrical machine is further stored in the storage medium.

18. The drive unit according to claim 8, wherein the positional error information of the rotation sensor is information of a zero-point error between a voltage waveform as the information of the counter electromotive force and a pulse signal as the output information from the rotation sensor.

19. The drive unit according to claim 9, wherein management information including an identification code of the rotating electrical machine is further stored in the storage medium.

20. The drive unit according to claim 9, wherein the positional error information of the rotation sensor is information of a zero-point error between a voltage waveform as the information of the counter electromotive force and a pulse signal as the output information from the rotation sensor.

21. The drive unit according to claim 10, wherein the positional error information of the rotation sensor is information of a zero-point error between a voltage waveform as the information of the counter electromotive force and a pulse signal as the output information from the rotation sensor.

22. The drive unit according to claim 12, wherein the positional error information of the rotation sensor is information of a zero-point error between a voltage waveform as the information of the counter electromotive force and a pulse signal as the output information from the rotation sensor.

23. The drive unit according to claim 17, wherein the positional error information of the rotation sensor is information of a zero-point error between a voltage waveform as the information of the counter electromotive force and a pulse signal as the output information from the rotation sensor.

24. The drive unit according to claim 19, wherein the positional error information of the rotation sensor is information of a zero-point error between a voltage waveform as the information of the counter electromotive force and a pulse signal as the output information from the rotation sensor.

25. A method for manufacturing a drive unit including a rotating electrical machine and a rotation sensor that detects a rotational position of a rotor of the rotating electrical machine, comprising:

assembling the rotating electrical machine and the rotation sensor;

measuring a counter electromotive force by mechanically driving the rotating electrical machine;

obtaining positional error information of the rotation sensor based on information of the counter electromotive force and output information from the rotation sensor;

storing the positional error information in a storage medium; and

integrally arranging the storage medium to the drive unit in such a state that the storage medium is readable upon assembling a control device for controlling the rotating electrical machine.